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x in (-oo:+oo)
(4/11)*x-((8/3)*x) = x/15 // - x/15
(4/11)*x-((8/3)*x)-(x/15) = 0
(4/11)*x+(-8/3)*x-(x/15) = 0
-391/165*x = 0 // : -391/165
x = 0
x = 0
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